natural sand aggregate  天然砂石骨料

natural sand content  天然砂含量

natural sand with stone  天然沙夹石

Natural Sand-Gravel  天然砂砾

natural bonded molding sand  天然模砂

natural bonded sand  天然粘结砂

natural building sand  天然建筑砂

natural clay-boned sand  天然粘土砂

natural repose angle of sand  砂土自然静止角

natural silica Sand  天然硅砂

natural siliceous sand  天然石英砂

Natural Yellow Loam Clay-Bonded Sand  黄壤土砂

sand—sand juxtaposition  砂岩对接

natural draught natural draft  自然通风

coastal sand and continental shelf sand  海岸砂和大陆架砂

concial sand from coarse sand  粗砂锥辗硅砂

dike of sand pile and sand quilt  砂桩砂被堤

prevent sand and confrol sand  防沙治沙

Sand-Blowing and Sand-Filling Ground Leveling  吹填砂场平